Rick's Free Auto Repair Advice

Posts Tagged: MAP Sensor

OBDII trouble Codes

OBDII trouble Codes I can’t tell you how many times forum members write in and say, “The computer said to replace the oxygen sensor. I replaced it and now it says to replace it again.” Let’s get one thing straight…..the computer NEVER says to replace a part. It only tell you what condition the OBDII trouble Codes. Here’s a typical example: P0137 – Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2) Now most of you would say the computer has determined that the oxygen sensor is bad. That’s NOT … Read More


Fix code P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low The Manifold Absolute Pressure sensor/Barometric Pressure Sensor (MAP/BARO)is a “speed density” method of determining the air fuel ratio. The sensor measures intake manifold vacuum, which varies depending on how wide open the throttle is. However, while the pistons are pulling a vacuum on the down-stroke, outside barometric pressure is also pushing air into the cylinder. So the sensor actually takes two readings—one before the engine starts (barometer pressure) and one after the engine starts. Once the engine is running, the computer … Read More

Test MAP Sensor on Chrysler vehicles

How to Test MAP Sensor on Chrysler vehicles Mid 90’s Chrysler vehicles used a Manifold Absolute Pressure Sensor (MAP sensor) to determine the vacuum and air density of incoming air. Here’s how to test it. When you first turn the key without starting the engine, the computer takes a reading on the MAP to get barometric pressure. Then, when you start the engine and vacuum is applied to the MAP, it can subtracts barometric from manifold vacuum to get a reading on density. As you open the throttle, manifold vacuum … Read More

MAP sensor — what it does

What does MAP sensor do A Manifold Absolute Pressure (MAP sensor) gives the engine’s computer some data with which it can calculate the density of the incoming air. Calculating density is not as easy as it sounds. Sure, atmospheric pressure gives us some idea of the air’s weight. But remember, the engine is sucking in air, so it’s creating a vacuum. With atmospheric pressure pushing air into the engine and the pistons sucking air in, the computer really wants to know the difference between the two. That’s why the reading … Read More

Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN